$re = '/(\r|\n| |\t)+\<Grid(\r|\n| |\t)+Grid\.Row="0"(\r|\n| |\t)+IsVisible="False"(\r|\n| |\t)+Style="\{StaticResource(\r|\n| |\t)+MadressahFilterPickerGridBackgroundStyle\}"\>/';
$str = ' <Grid Grid.Row="2" Grid.Column="2" RowSpacing="0">
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<Grid Grid.Row="0" Style="{StaticResource MadressahFilterPickerGridBackgroundStyle}">
<StackLayout Orientation="Horizontal">
<StackLayout.GestureRecognizers>
<TapGestureRecognizer Tapped="ParentTapGestureRecognizer_Tapped" />
</StackLayout.GestureRecognizers>
<Label x:Name="parentName" Text="{Binding ParentPicker}"
BindingContext="{ Binding Source={x:Reference Root}, Path=BindingContext}"
Style="{StaticResource MadressahFilterPickerLabelStyle}" LineBreakMode="NoWrap"/>
<Label Style="{StaticResource MadressahPickerArrowStyle}" />
</StackLayout>
</Grid>
<Grid Grid.Row="0" IsVisible="False"
Style="{StaticResource MadressahFilterPickerGridBackgroundStyle}">
<Picker x:Name="parentList" Title="{i18n:Translate selectparent}"
ItemsSource="{Binding ParentList}"
ItemDisplayBinding="{Binding FullName}"
SelectedItem="{Binding ParentSelected}"
BindingContext="{ Binding Source={x:Reference Root}, Path=BindingContext}" />
</Grid>
</Grid>';
preg_match_all($re, $str, $matches, PREG_SET_ORDER, 0);
// Print the entire match result
var_dump($matches);
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for PHP, please visit: http://php.net/manual/en/ref.pcre.php